Damper-regulator



G. W. BIGELOW.

DAMPER REGULATOR. APPLICIATIOH FILED MAY a2, 1919.

1, 340,106. rammed May 11,1920.

GEORGE W. BIGELOW, OF NEW HAVEN, CONNECTICUT.

Specification of Letters Patent.

DAMPER-REGULATOR.

Patented May 11, 1920.

Application filed. May 12, 1919. Serial No. 296,355.

To all whom it may concern:

Be it known that I, GEORGE WV. BIGELow, a citizen of the United States, residing at New Haven, in the county of New Haven and State of Connecticut, have invented certain new and useful Improvements in Damper-Regulators, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to a new and improved damper regulator having for its object, among other things, to provide a device that will be actuated by the pressure within the boiler to automatically control the damper in the flue, whereby the draft in the fire box may be varied to increase or decrease said pressure.

To these, and other ends, my invention consists in the damper regulator, having certain details of construction and combinations of parts, as will be hereinafter described and more particularly pointed out in the claims.

In the drawings, reference to which is now made, and wherein like numerals of reference designate like parts in the several vice, I provide a base 1, which may be se-' cured either to the boiler or adjacent thereto, said base being provided with a hub 2, having a chamber 4 therein, and closed at its lower end'by a cap 3, in which is secured a pet cock 5 for drainage purposes. Threaded into one side of the hub 2 is a pipe 6, through which the steam or fluid in the boiler is conveyed to the chamber 1 through the port 7 Above the base 1, concentric therewith, is a Valve casing 8, between which and said base is the ring 9, having a chamber 10 therein terminating at its lower end in the shoulder 11. v

The numeral 12 designates the piston having a head 13 thereon which is operatively mounted within the chamber 10, and secured thereto by the nut 14 threaded on said pis ton, is the flexible diaphragm 15 which lies between'the said base 1' and ring 9. Surrounding the shank of the piston 12 is a spring 16 that abuts at one end against the shoulder 17 integral with said base and at the other end against a collar 18 contacting with the nut 19 threaded ontosaid shank and providing means for varying the tension of said spring, which is so adjusted that its normal tension is counter-balanced by pressure of the steam or the fluid within the chamber 4, the piston 12 being then in its down position.

Through the shoulder 17 are a plurality of port-holes 20, which, with the open space 21 around the shank of the piston 12, provide means for connecting the upper chamber 22 in the base 1 with the chamber 4..

Axially movable in the valve casing 8 is the valve 23, having an annular groove 24 near its upper end with a chamber 25 therein, open at one end and adjacent to the bottom. thereof is one or more radial port-holes 26, opening into the said annular groove 24. When mounted in the valve casing the head 27 of this valve rests on the valve seat 28 and the bottom thereof is adjacent to the top of a valve button or rocking member 29, preferably of slightly larger diameter than said valve 23 and having a recess 30 therein with a semi-circular bottom which rides upon the top of the semi-circular lug 31 of the piston head 13. This method of engagement between the button 29 and the head 13 always insures a proper alinement between said button and valve if in the manufacture and assembling of the parts and the other against the bottom of said chamber 25.

The head 27 of the valve 23 is normally held on its seat 28 by the action of a spring 33, which is within the chamber 36 and sur rounds the stem 34 on said valve and abuts against a plug 35 threaded in the'valve casing 8 and closing said chamber. Water under pressure is conveyed to the chamber 36 throughthe pipe 37 and port 38. In the valve casing 8 is a chamber 53, which. is closed at its upper end by the plug 54 and opening therein is a port 55 which is above the plug 35 and the port 56, which is in line with the annular groove 2101? the valve 23 when in its closed position.

Threaded in the upper end of the valve action.

'the same upon the rod 44.

The flue is designated by the numeral 47, within which is mounted'the shaft 48 having the bell crank 49 thereon, said bell crank having a veight 50 upon one arm and a chain 51 connecting the other arm with the suspension rod 44 and passing over an idler pulley 52.

Threaded into said valve casing 8 is an outlet pipe 57, which is connected with the chamber 58 in the bottom of said casing by a port 59. In its zero position, that is, when the fluid or steam is at the predetermined position in the boiler, the piston 12 is held .in its down position by the spring 16 and the underside of the head 13 is resting on the shoulders 11 with the diaphragm.15

flexed slightly downward and the head 27 of the valve 23 is held upon its seat by the tension of the spring 33. These relative positions are illustrated in Fig. 1, it being understood, of course, that the chamber '36 is always filled with fluid under pressure admitted through the inlet pipe 37.

:If the "pressure within the chamber 4 is increased above the predetermined pressure the piston 12 moves upwardly against the tension of the spring 16, thus lifting the piston head 13 off its seat'adjacent the shoulder 11 and through the valve button 29 also lifts the valve '23 and raises the head 27 thereof ofl its seat 28, the tension of the spring 33 being considerably less than that of the spring 16, which thereby permits said As soon as the valve 27 is lifted off its seat the fluid under pressure in the chamber 36 enters the annular groove '26 in the valve 23 and passes through the port '56 into the chamber 53, then through the port 55 into the cylinder 39, thereby forcing the piston 41 upwardly, and the counterweight 50 on the crank 49 moves the damper 60 toward its closed position, shown by dotted lines in Fig. '1, its open position being illustrated by full lines. The closing of the damper, of course, either wholly or in part, shuts ofl the draft according to the degree of closureand thereby reducing the boiler pressure. WVhen the pressure is reduced to its predetermined pressure. the spring 16 pulls the piston 12 downwardly and returns the head 13 thereon to its seat against the shoulder 11, at which time the valve 23 follows said piston through the action of the spring 33, shutting off the escape of fluid from the chamber 36. The fluid within the cylinder 39 is now forced therefrom by reason of the weights 46 through the port 55, chamber 53, port 56, radial ports 26, into the chamber 25 in valve 23, and passes between the lower edge of said valve and the top of the valve button 29 into the chamber 58, thence through the port 59 and escapes through the outlet pipe 57, during which time the damper is again opened and the draft increased.

In assembling the several parts the valve button 29 is mounted so that there is a slight open space between the top thereof and the underside of the valve 23, amount ing to not over a few thousandths of an inch, which permits the leakage of fluid therethrough from the chamber 25.

In practice,-it is possible to dispense with the valve button 29 and provide a flat head for the piston 13 that will engage with the valve and perform the same function as the said button.

Minor changes and alterations can be made in the invention as shown, and I would therefore have it understood that I do not limit myself to the exact construction herein described, and shown in the drawings, but claim all that falls fairly within the spirit and scope of the appended claims.

Having described my invention, what I claim as new and desire to secure by Letters Patent, is

1. In a damper actuating mechanism, the combination with a base member; of a valve casing having a chamber therein; a ring between said base member and valve casing; a piston operatively mounted within said base and ring; a spring for actuating said piston in one of its positions, tensioned so as to hold the head. of said piston on its seat at a predetermined pressure; a valve having a chamber therein, an annular groove surrounding it, and a radial port opening into said chamber and groove; a plug secured within said casing; a spring in the chamber of said valve casing between said plug and valve for normally holding the latter on its seat; a rocking member between said piston and said valve; an inlet pipe for admitting fluid into the chamber of said valve casing and an outlet for the fluid after itthas passed through said valve.

2. In a damper actuating mechanism, the

- combination with a base member; of a valve casing having two chambers therein, said chambers being joined near the top and bottom by ports whereby liquid will flow uninterruptedly through said ports and one of said chambers; a ring between said base member and valve casing; a piston operatively mounted within said base and ring; a spring for actuating said piston in one of its positions; tensioned so as to hold the head of said piston on its seat at a predetermined pressure; a valve having a chamber therein, an annular groove surrounding it and a radial port opening into said chamber and groove; a plug secured within said casing; a spring in the chamber of said valve casing between. said plug and valve for normally holding the latter on its seat; a rocking member between said piston and said valve; a spring between said valve and said rocking member, the tension of which is exerted to hold said elements apart; an inlet pipe for admitting fluid into one of the chambers of said valve casing; and an outlet for the fluid after it has passed through said valve.

3. In a damper actuating mechanism, the combination with a base member; of a valve casing having two chambers therein, said chambers being joined near the top and bottom by ports whereby liquid will flow uninterruptedly through said ports and one of said chambers; a ring between said base member and valve casing; a piston operatively mounted within said base and ring;

a spring for actuating said piston in one of its positions, tensioned so as to hold the head ofsaid piston on its seat at a predetermined pressure; a valve having a chamber therein, an annular groove surrounding it and a radial port opening into said chamher and groove; a plug secured within said casing; a spring in the chamber of said valve casing between said plug and valve for normally holding the latter on its seat; a rocking member between said piston and said valve, the arrangement of said valve and rocking member being such that when said last mentioned valve and said piston are on their seats there is a limited open space therebetween; an inlet pipe for ad mitting fluid into one of the chambers of said valve casing; and an outlet for the fluid after it has passed through said valve.

In testimony whereof I have hereunto affixed my signature.

GEORGE W. BIGELOW. 

